公开(公告)号：US20250063183A1

公开(公告)日：2025-02-20

申请号：US18776481

申请日：2024-07-18

Applicant: Axis AB

Inventor： Björn ARDÖ ,  Johan NYSTRÖM ,  Viktor EDPALM ,  Song YUAN ,  Johan FÖRBERG

IPC: H04N19/423 ,  H04N19/124 ,  H04N19/172 ,  H04N19/176 ,  H04N19/182 ,  H04N19/186 ,  H04N19/463 ,  H04N19/60 ,  H04N23/80

Abstract: Systems, methods and non-transitory computer-readable media transform raw image data into a video stream comprising a plurality of encoded image frames. To reduce memory bandwidth and power consumption, compression rates of sets of imaging data temporarily stored in memory during the transformation of raw image data into the video stream are adapted based on encoding configurations, on a pixel block level.

公开(公告)号：US20230262335A1

公开(公告)日：2023-08-17

申请号：US18160330

申请日：2023-01-27

Applicant: Axis AB

Inventor： Björn ARDÖ

IPC: H04N23/698 ,  H04N5/265 ,  H04N23/61 ,  H04N23/62 ,  H04N23/45

CPC classification number: H04N23/698 ,  H04N5/265 ,  H04N23/61 ,  H04N23/62 ,  H04N23/45

Abstract: There is provided techniques for setting frame rates of a camera. The camera comprises a plurality of image sensors arranged to capture images to be stitched into a panorama image of a scene. Information of a respective angle between the optical axis of each of the plurality of image sensors and a direction along which a straight path structure, to be monitored by the camera, extends through the scene is obtained. The plurality of image sensors are divided into at least two groups as a function of the angles. All the angles of the image sensors within each of the at least two groups are part of its own continuous angle interval. One frame rate is set per each of the at least two groups. The frame rate decreases from the group with highest continuous angle interval towards the group with lowest continuous angle interval.

公开(公告)号：US20220245760A1

公开(公告)日：2022-08-04

申请号：US17558594

申请日：2021-12-22

Applicant: Axis AB

Inventor： Björn ARDÖ

IPC: G06T3/40 ,  G06T7/80

Abstract: A method includes aligning a first image frame of a first stream of images from a first image sensor and a further first image frame of a second stream of images from a second image sensor according to a first alignment, aligning a second image frame of the first stream of images and a further second image frame of the second stream of images according to the first alignment, obtaining a first stitched image frame by blending the aligned first image frame and further first image frame in a first blending area according to a first blending function, obtaining second stitched image frame by blending the aligned second image frame and the further second image frame in a second blending area according to a second blending function, and evaluating the first alignment from a difference pattern calculated from pixel values of the first stitched frame and the second stitched frame.

公开(公告)号：US20200304825A1

公开(公告)日：2020-09-24

申请号：US16804023

申请日：2020-02-28

Applicant: Axis AB

Inventor： Björn ARDÖ ,  Toivo HENNINGSSON

IPC: H04N19/513 ,  H04N19/172 ,  H04N19/105 ,  H04N19/139 ,  H04N19/182

Abstract: The present invention relates to the field of image encoding. In particular, it relates to methods and devices where the concept of auxiliary frames may be employed to reduce or remove the need of copying data, for reference encoding purposes, between encoders which encode different parts of an image frame. This purpose is achieved by spatially modifying (S104) original image data before encoding (S106, S108) it using the encoders, and using (S110) the encoded image data as image data of an auxiliary frame. The auxiliary frame is referenced by an inter frame comprising motion vectors corresponding to a restoration of the auxiliary frame image data back to a spatial arrangement of the original image data.

公开(公告)号：US20220335706A1

公开(公告)日：2022-10-20

申请号：US17679114

申请日：2022-02-24

Applicant: Axis AB

Inventor： Björn ARDÖ

IPC: G06V10/60 ,  G06T7/571 ,  H04N5/225 ,  H04N5/232 ,  G06T3/00

Abstract: A method for determining whether or not a transparent protective cover of a video camera comprising a lens-based optical imaging system is partly covered by a foreign object is disclosed. The method comprises: obtaining (402) a first captured image frame captured by the video camera with a first depth of field; obtaining (404) a second captured image frame captured by the video camera with a second depth of field which differs from the first depth of field; and determining (406) whether or not the protective cover is partly covered by the foreign object by analysing whether or not the first and second captured image frames are affected by presence of the foreign object on the protective cover such that the difference between the first depth of field and the second depth of field results in a difference in a luminance pattern of corresponding pixels of a first image frame and a second image frame. The first image frame is based on the first captured image frame and the second image frame is based on the second captured image frame.

公开(公告)号：US20220292833A1

公开(公告)日：2022-09-15

申请号：US17669403

申请日：2022-02-11

Applicant: Axis AB

Inventor： Björn ARDÖ

IPC: G06V20/52 ,  G06V20/40 ,  G06V10/10

Abstract: The present disclosure relates to a method performed by a monitoring camera (100) for handling a first and a second video stream (201a, 201b). The monitoring camera (100) obtains a first video stream (201a) from a first image sensor (103a) and a second video stream (201b) from a second image sensor (103b). A field of view of the first video stream (201a) partly overlaps with the second video stream (201b). The monitoring camera (100) identifies a moving object (205) in the overlap area (203). The monitoring camera (100) divides the moving object (205) into a plurality of sub objects (210). The monitoring camera (100) performs a hard handover of the sub objects (210) from the first to the second video stream (201a, 201b) when the sub object (210) is within the overlap area (203) and when a point of the sub object (210) passes a border (208).

公开(公告)号：US20220171978A1

公开(公告)日：2022-06-02

申请号：US17510407

申请日：2021-10-26

Applicant: Axis AB

Inventor： Björn ARDÖ ,  Anton JAKOBSSON

IPC: G06K9/00 ,  G06K9/46 ,  G06K9/20 ,  G06K9/32

Abstract: A method (100), a device (600;700) and a system (800) for processing image data representing a scene for extracting features related to objects in the scene using a convolutional neural network are disclosed. Two or more portions of the image data representing a respective one of two or more portions of the scene are processed (S110), by means of a respective one of two or more circuitries, through a first number of layers of the convolutional neural network to form two or more outputs, wherein the two or more portions of the scene are partially overlapping. The two or more outputs are combined (S120) to form a combined output, and the combined output is processed (S130) through a second number of layers of the convolutional neural network by means of one of the two or more circuitries for extracting features related to objects in the scene.